1 . 吸烟不仅有害健康，而且污染环境。
________________________________________

2 . Smoking is ______ (harm) to your body.

3 . —I’m afraid e-books might ________ us, especially our eyes.
—Hmm. But they will be useful for us as long as we put them to good use.

A．be good for

B．be friendly to

C．be harmful to

D．be helpful to

4 . Eating too much sugar is h________ to our teeth.

5 . Staying up often is h________ to your health.

6 . 吸烟对你的健康有害。（be harmful to）
________________________________________________

7 . 太多甜食有害健康。（be harmful to）
_____________________________________________________________

9 . 我们正在讨论快餐为什么有害健康。
We are discussing why fast food is _________ _________ our health.

10 . It’s known ________ us that polluted air and water are harmful ________ our health.

A．to; for

B．to; to

C．for; to

D．for; for